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Let us assume that the 'football' is an American football, rather than the (nearly) spherical ball that is usually black and white, which is called a 'football' in most countries.

The American football is made to spiral by the way that it is thrown. The ball is held with the fingers on one side and the thumb on the other side. As the throwing arm moves forward the thumb pushes the ball toward the fingers. This makes the ball roll along the fingers, making it rotate. When the ball is released, the rotation (the spin) continues. The spin stabilizes the ball, so that the pointed end is pointing in the direction of motion. This allows the ball to go farther than it would if the ball were tumbling.

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Q: What makes a football spiral?
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